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Re: Check engine light question...another try..
Posted by Dean (more from Dean) on Sat, 8 Mar 2003 11:17:35
In Reply to: Re: Check engine light question...another try.., Quattro, Fri, 7 Mar 2003 17:59:51
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The CEL is because the ECU did not see an in-range engine temp within a certain time window after starting. That is relatively basic.
You can check the temp sender with an ohm meter. It will be around 1 or 200 ohms when cold and mayber around 2K with a hot engine. If shorted or open circuit, replace it. If it seems to be operating properly when measured, check the mating harned plug and wires for damage etc.
Probably a P0128 engine code. A P0115 could be possible, but that should really come up quite fast, not after a delay. A working TS with a cold stat would also throw a P0128.
But codes aside. You can quickly check that the TS is working, so measure it and the results will tell you a lot. You can also put a resistor across the harness connector and see that the temp indicator responds. Try 200 ohms. That will qualify everything on the harness side. I can't recall if the TS has one or two wires. If one wire, check that the TS body has zero ohms resistance to ground (the engine block).
posted by 66.139.120...
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